Data Sheet
37. Series-Parallel Circuit Paths
Build the circuit above. In this circuit, the lamp (76) that indicates current ow cannot turn on by just turning the switch
(62) ON. If you turn the switch (62) ON and press and hold the press switch (61), then current will ow. Or if you turn
the switch (62) ON and move the magnet (7) towards the reed switch (83), then current will ow. Since switch (62) is in
series with the other two switches that are in parallel, this makes a series-parallel circuit path for the lamp (76). This kind
of circuit could be used in a hotel room where your key card must be inserted in a card holder near the door to enable
a closed circuit, but you still need to turn on switches in the room to have certain lights or devices close the circuit and
turn on.
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